Category-A: IAF Units/Commands/Institutions. Category-B: Ministry of Defence organizations including other Services/Defence PSUs, Category-C: Cetnre/State Govt and Orgns/Local/Municipal and local bodies under their control, (the requests shall be forwarded to the Dte of Lgs Plg, Air Headquarters, WB-VI, RK Puram, New Delhi-66 along with recommendations of an officer not below the rank of Jt Secretary in the Government of India)Category-D:Central/State Government Educational Institutions/Colleges/Schools;Category-E: Private organizations/educational institutions/colleges/schools/NGOs and others; and,Category-F: Foreign Government/Agencies.